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Side-by-side comparison of API pricing, context window, latency, and benchmark performance. Data refreshed daily from provider APIs and ModelStop's own latency probes.
💰OpenAI: GPT-5.1-Codex-Max is 100% cheaper than Z.ai: GLM Latest
⚡Z.ai: GLM Latest is 21ms faster than OpenAI: GPT-5.1-Codex-Max
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
| Spec | OpenAI: GPT-5.1-Codex-Max | Z.ai: GLM Latest |
|---|---|---|
| Provider | openai | ~z-ai |
| Input price / 1M tokens | Free | $0.07 |
| Output price / 1M tokens | — | $1.40 |
| Context window | 400k tokens | 1049k tokens |
| Latency (p50) | 21ms | — |
| Best benchmark score | — | — |
| Open source | No | No |
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
This model always redirects to the latest GLM model from Z.ai.
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